Earth working – Automatic power control – Draft responsive
Patent
1996-09-11
1998-10-27
Carone, Michael J.
Earth working
Automatic power control
Draft responsive
172 2, 37348, F16D 3102, G06F 1520
Patent
active
058266666
ABSTRACT:
The finishing precision and uniformity of hardness of a surface finished by a construction machine, such as back-hoe, is improved by modifying the targets of a position-tracking control system based on work-load applied to the end effector of the construction machine. For example, compaction of a surface, contoured by a position-tracking, back-hoe, can be made more uniform. This is accomplished by adjusting actuator targets, otherwise controlled on the basis of positional and speed constraints, in response to a detected work load acting on the end effector. To detect work load, a hydraulic fluid pressure signal can be applied to a computer which generates target position and speed commands to the feedback system. The control circuit may be arranged to hold work load constant (generating a constant compaction force for example) or, in response to a priority signal, the circuit can give a selected weight to both the positional constraints and the work load constraints. Another benefit of altering position-tracking in response to work load is improved coordination of actuators. For example, the gain of feedback and feedforward signals of a position-tracking control system can be increased when a detected load is heavy, increasing response, and attenuated when the load is light.
REFERENCES:
patent: 4807136 (1989-02-01), Rutkowski et al.
patent: 4910673 (1990-03-01), Narisawa et al.
patent: 5398766 (1995-03-01), Nakayama et al.
patent: 5488787 (1996-02-01), Aoyagi et al.
patent: 5552690 (1996-09-01), Hiraoka
Ono Tomoaki
Tozawa Shoji
Carone Michael J.
Pezzuto Robert
Shin Caterpillar Mitsubishi Ltd.
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